/Engine/Plugins/Runtime/RigVM/Source/RigVM/Public/RigVMCore/RigVM.h
Returns an external variable Def given it's name.
[FRigVMExternalVariableDef](API\Plugins\RigVM\RigVMCore\FRigVMExternalVariableDef) GetExternalVariableDefByName ( const [FName](API\Runtime\Core\UObject\FName) & InExternalVariableName )